package com.base.dehong.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;

public class Base64Coder{

	// Mapping table from 6-bit nibbles to Base64 characters.
	private static char[] map1 = new char[64];
	static
	{
		int i = 0;
		for (char c = 'A'; c <= 'Z'; c++)
		{
			map1[i++] = c;
		}
		for (char c = 'a'; c <= 'z'; c++)
		{
			map1[i++] = c;
		}
		for (char c = '0'; c <= '9'; c++)
		{
			map1[i++] = c;
		}
		map1[i++] = '+';
		map1[i++] = '/';
	}

	// Mapping table from Base64 characters to 6-bit nibbles.
	private static byte[] map2 = new byte[128];
	static
	{
		for (int i = 0; i < map2.length; i++)
		{
			map2[i] = -1;
		}
		for (int i = 0; i < 64; i++)
		{
			map2[map1[i]] = (byte) i;
		}
	}

	public static String getBase64(String filePath){
		String base64code = "";
		if(filePath != null){
			File picFile = new File(filePath);
			InputStream is = null;
			try{
				is = new FileInputStream(picFile);
				int size = is.available();
				if(size > 0){
					byte[] bytes = new byte[size];
					is.read(bytes);
					base64code = Base64Coder.encode(bytes);
				}
			}catch(Exception ex){
				ex.printStackTrace();
				base64code = "";
			}finally{
				try {
					if(is != null){
						is.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return base64code;
		}else{
			return "";
		}
	}

	public static String encode(byte[] in)
	{
		int iLen = in.length;
		int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
		int oLen = ((iLen + 2) / 3) * 4; // output length including padding
		char[] out = new char[oLen];
		int ip = 0;
		int op = 0;
		while (ip < iLen)
		{
			int i0 = in[ip++] & 0xff;
			int i1 = ip < iLen ? in[ip++] & 0xff : 0;
			int i2 = ip < iLen ? in[ip++] & 0xff : 0;
			int o0 = i0 >>> 2;
			int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
			int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
			int o3 = i2 & 0x3F;
			out[op++] = map1[o0];
			out[op++] = map1[o1];
			out[op] = op < oDataLen ? map1[o2] : '=';
			op++;
			out[op] = op < oDataLen ? map1[o3] : '=';
			op++;
		}
		return new String(out);
	}

	public static byte[] decode(String s)
	{
		byte[] a = decode(s.toCharArray());
		return a;
	}

	private static byte[] decode(char[] in)
	{
		int iLen = in.length;
		if (iLen % 4 != 0)
		{
			throw new IllegalArgumentException(
					"BASE64数据长度不可被4整除");
		} while (iLen > 0 && in[iLen - 1] == '=')
		{
			iLen--;
		}
		int oLen = (iLen * 3) / 4;
		byte[] out = new byte[oLen];
		int ip = 0;
		int op = 0;
		while (ip < iLen)
		{
			int i0 = in[ip++];
			int i1 = in[ip++];
			int i2 = ip < iLen ? in[ip++] : 'A';
			int i3 = ip < iLen ? in[ip++] : 'A';
			if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
			{
				throw new IllegalArgumentException(
						"Illegal character in Base64 encoded data.");
			}
			int b0 = map2[i0];
			int b1 = map2[i1];
			int b2 = map2[i2];
			int b3 = map2[i3];
			if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
			{
				throw new IllegalArgumentException(
						"Illegal character in Base64 encoded data.");
			}
			int o0 = (b0 << 2) | (b1 >>> 4);
			int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
			int o2 = ((b2 & 3) << 6) | b3;
			out[op++] = (byte) o0;
			if (op < oLen)
			{
				out[op++] = (byte) o1;
			}
			if (op < oLen)
			{
				out[op++] = (byte) o2;
			}
		}
		return out;
	}
	/** 
	 * bitmap转为base64 
	 * @param bitmap 
	 * @return 
	 */  
	public static String bitmapToBase64(Bitmap bitmap) {  

		String result = null;  
		ByteArrayOutputStream baos = null;  
		try {  
			if (bitmap != null) {  
				baos = new ByteArrayOutputStream();  
				bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);  

				baos.flush();  
				baos.close();  

				byte[] bitmapBytes = baos.toByteArray();  
				result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);  
			}  
		} catch (IOException e) {  
			e.printStackTrace();  
		} finally {  
			try {  
				if (baos != null) {  
					baos.flush();  
					baos.close();  
				}  
			} catch (IOException e) {  
				e.printStackTrace();  
			}  
		}  
		return result;  
	}
	/**
	 * 将base64转换成bitmap图片
	 *
	 * @param string base64字符串
	 * @return bitmap
	 */
	public static Bitmap stringToBitmap(String string) {
		// 将字符串转换成Bitmap类型
		Bitmap bitmap = null;
		try {
			byte[] bitmapArray;
			bitmapArray = Base64.decode(string, Base64.DEFAULT);
			bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,
					bitmapArray.length);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return bitmap;
	}

}
